body,html {
	margin:0;
	padding:0;  
	height:100%;
	font-family:"微软雅黑";
}
ul ,li {
	margin:0;
	padding:0;
	list-style: none;	
}
.clearfix {
	&:after {
	  visibility: hidden;
	  display: block;
	  font-size: 0;
	  content: " ";
	  clear: both;
	  height: 0;
	}
}
.fl {
	float:left;
}
.fr {
	float:right;
}